Hi, let me share my newest experience.
Seeing pitroch having the watermark disappeared, I grew a pair and did the upgrade too 🙂
No watermark!
My bet is on android and/or android auto version as my phone is Pixel 7, everything upgraded to latest version, coolwalk and stuff.
Android version: 13 build TQ2A.230505.002
Android Auto version: 9.3.631434-release